code: def setUp(self):
      self.xs = [
          numpy.random.uniform(-1, 1, self.a_shape).astype(
              numpy.float32
          ),
          numpy.random.uniform(-1, 1, self.b_shape).astype(
              numpy.float32
          ),
      ]
  
file_path: chainer/tests/chainer_tests/functions_tests/array_tests/test_hstack.py
imports: import unittest
  import numpy
  import six
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling the TestHstackTypeCheck obj's underlying member method code with example usage: obj.setUp() without return types